MUNICH, GERMANY - JANUARY 01: Riot police armed with machine guns controls the street in front of Pasing railway station on January 1, 2016 in Munich, Germany. According to Joachim Herrmann, Bavarian Secretary of the Interior, there was intelligence for an IS terror attack planned for new Year's eve in in at least two Munich railway stations. (Photo by Johannes Simon/Getty Images)

MUNICH, GERMANY - JANUARY 01: Riot police armed with machine guns controls the street in front of Pasing railway station on January 1, 2016 in Munich, Germany. According to Joachim Herrmann, Bavarian Secretary of the Interior, there was intelligence for an IS terror attack planned for new Year's eve in in at least two Munich railway stations. (Photo by Johannes Simon/Getty Images)

MUNICH, GERMANY - JANUARY 01: Riot police armed with machine guns controls the street in front of Pasing railway station on January 1, 2016 in Munich, Germany. According to Joachim Herrmann, Bavarian Secretary of the Interior, there was intelligence for an IS terror attack planned for new Year's eve in in at least two Munich railway stations. (Photo by Johannes Simon/Getty Images)

MUNICH, GERMANY - JANUARY 01: Riot police armed with machine guns controls the street in front of Pasing railway station on January 1, 2016 in Munich, Germany. According to Joachim Herrmann, Bavarian Secretary of the Interior, there was intelligence for an IS terror attack planned for new Year's eve in in at least two Munich railway stations. (Photo by Johannes Simon/Getty Images)

MUNICH, GERMANY - JANUARY 01: Police men guard the metro entrance in front of Munich main station on January 1, 2016 in Munich, Germany. According to Joachim Herrmann, Bavarian Secretary of the Interior, there was intelligence for an IS terror attack planned for new Year's eve in in at least two Munich railway stations. (Photo by Johannes Simon/Getty Images)

MUNICH, GERMANY - JANUARY 01: Riot police armed with machine guns controls the street in front of Pasing railway station on January 1, 2016 in Munich, Germany. According to Joachim Herrmann, Bavarian Secretary of the Interior, there was intelligence for an IS terror attack planned for new Year's eve in in at least two Munich railway stations. (Photo by Johannes Simon/Getty Images)

MUNICH, GERMANY - JANUARY 01: A police man gives explanations to worried people in front of Pasing railway station on January 1, 2016 in Munich, Germany. According to Joachim Herrmann, Bavarian Secretary of the Interior, there was intelligence for an IS terror attack planned for new Year's eve in in at least two Munich railway stations. (Photo by Johannes Simon/Getty Images)

MUNICH, GERMANY - JANUARY 01: Riot police armed with machine guns controls the street in front of Pasing railway station on January 1, 2016 in Munich, Germany. According to Joachim Herrmann, Bavarian Secretary of the Interior, there was intelligence for an IS terror attack planned for new Year's eve in in at least two Munich railway stations. (Photo by Johannes Simon/Getty Images)

MUNICH, GERMANY - JANUARY 01: A riot police man armed with a machine gun controls the street in front of Pasing railway station on January 1, 2016 in Munich, Germany. According to Joachim Herrmann, Bavarian Secretary of the Interior, there was intelligence for an IS terror attack planned for new Year's eve in in at least two Munich railway stations. (Photo by Johannes Simon/Getty Images)

MUNICH, GERMANY - JANUARY 01: Police men guard the metro entrance in front of Munich main station on January 1, 2016 in Munich, Germany. According to Joachim Herrmann, Bavarian Secretary of the Interior, there was intelligence for an IS terror attack planned for new Year's eve in in at least two Munich railway stations. (Photo by Johannes Simon/Getty Images)

MUNICH, GERMANY - JANUARY 01: Police men guard the main entrance in front of Munich main station on January 1, 2016 in Munich, Germany. According to Joachim Herrmann, Bavarian Secretary of the Interior, there was intelligence for an IS terror attack planned for new Year's eve in in at least two Munich railway stations. (Photo by Johannes Simon/Getty Images)

MUNICH, GERMANY - JANUARY 01: Police men guard the main entrance in front of Munich main station on January 1, 2016 in Munich, Germany. According to Joachim Herrmann, Bavarian Secretary of the Interior, there was intelligence for an IS terror attack planned for new Year's eve in in at least two Munich railway stations. (Photo by Johannes Simon/Getty Images)

MUNICH, GERMANY - JANUARY 01: A police woman speaks to concerned citizens in front of Munich main station on January 1, 2016 in Munich, Germany. According to Joachim Herrmann, Bavarian Secretary of the Interior, there was intelligence for an IS terror attack planned for new Year's eve in in at least two Munich railway stations. (Photo by Johannes Simon/Getty Images)

MUNICH, GERMANY - JANUARY 01: Police cars are parked in front of Munich main station on January 1, 2016 in Munich, Germany. According to Joachim Herrmann, Bavarian Secretary of the Interior, there was intelligence for an IS terror attack planned for new Year's eve in in at least two Munich railway stations. (Photo by Johannes Simon/Getty Images)

MUNICH, GERMANY - JANUARY 01: The entrance to Munich main station is closed on January 1, 2016 in Munich, Germany. According to Joachim Herrmann, Bavarian Secretary of the Interior, there was intelligence for an IS terror attack planned for new Year's eve in in at least two Munich railway stations. (Photo by Johannes Simon/Getty Images)

MUNICH, GERMANY - JANUARY 01: The main entrance to Munich main station is closed on January 1, 2016 in Munich, Germany. According to Joachim Herrmann, Bavarian Secretary of the Interior, there was intelligence for an IS terror attack planned for new Year's eve in in at least two Munich railway stations. (Photo by Johannes Simon/Getty Images)

MUNICH, GERMANY - JANUARY 01: Police officers guard the main entrance in front of Munich main station on January 1, 2016 in Munich, Germany. According to Joachim Herrmann, Bavarian Secretary of the Interior, there was intelligence for an IS terror attack planned for new Year's eve in in at least two Munich railway stations. (Photo by Johannes Simon/Getty Images)

MUNICH, GERMANY - JANUARY 01: Police officers check people in front of Munich main station on January 1, 2016 in Munich, Germany. According to Joachim Herrmann, Bavarian Secretary of the Interior, there was intelligence for an IS terror attack planned for new Year's eve in in at least two Munich railway stations. (Photo by Johannes Simon/Getty Images)

BERLIN, GERMANY - DECEMBER 31: Security officers inspect New Years Eve revelers' pockets and clothing prior to a public New Year's Eve party at the Brandenburg Gate on December 31, 2015 in Berlin, Germany. After the terrorist attacks in Paris the previous month that left 130 dead, security was increased for the annual event. A survey released the previous day found that two-thirds of Germans believe a terrorist attack will occur in their own country in 2016. (Photo by Adam Berry/Getty Images)

BERLIN, GERMANY - DECEMBER 31: Security officers inspect New Years Eve revelers' pockets and clothing prior to a public New Year's Eve party at the Brandenburg Gate on December 31, 2015 in Berlin, Germany. After the terrorist attacks in Paris the previous month that left 130 dead, security was increased for the annual event. A survey released the previous day found that two-thirds of Germans believe a terrorist attack will occur in their own country in 2016. (Photo by Adam Berry/Getty Images)

BERLIN, GERMANY - DECEMBER 31: Security officers inspect New Years Eve revelers' pockets and clothing prior to a public New Year's Eve party at the Brandenburg Gate on December 31, 2015 in Berlin, Germany. After the terrorist attacks in Paris the previous month that left 130 dead, security was increased for the annual event. A survey released the previous day found that two-thirds of Germans believe a terrorist attack will occur in their own country in 2016. (Photo by Adam Berry/Getty Images)

BERLIN, GERMANY - DECEMBER 31: A police van stands prior to a public New Year's Eve party at the Brandenburg Gate on December 31, 2015 in Berlin, Germany. After the terrorist attacks in Paris the previous month that left 130 dead, security was increased for the annual event. A survey released the previous day found that two-thirds of Germans believe a terrorist attack will occur in their own country in 2016. (Photo by Adam Berry/Getty Images)

BERLIN, GERMANY - DECEMBER 31: A police van stands prior to a public New Year's Eve party at the Brandenburg Gate on December 31, 2015 in Berlin, Germany. After the terrorist attacks in Paris the previous month that left 130 dead, security was increased for the annual event. A survey released the previous day found that two-thirds of Germans believe a terrorist attack will occur in their own country in 2016. (Photo by Adam Berry/Getty Images)

BERLIN, GERMANY - DECEMBER 31: Police officers hold a meeting prior to a public New Year's Eve party at the Brandenburg Gate on December 31, 2015 in Berlin, Germany. After the terrorist attacks in Paris the previous month that left 130 dead, security was increased for the annual event. A survey released the previous day found that two-thirds of Germans believe a terrorist attack will occur in their own country in 2016. (Photo by Adam Berry/Getty Images)

BERLIN, GERMANY - DECEMBER 31: Police officers hold a meeting prior to a public New Year's Eve party at the Brandenburg Gate on December 31, 2015 in Berlin, Germany. After the terrorist attacks in Paris the previous month that left 130 dead, security was increased for the annual event. A survey released the previous day found that two-thirds of Germans believe a terrorist attack will occur in their own country in 2016. (Photo by Adam Berry/Getty Images)

BERLIN, GERMANY - DECEMBER 31: Police officers hold a meeting prior to a public New Year's Eve party at the Brandenburg Gate on December 31, 2015 in Berlin, Germany. After the terrorist attacks in Paris the previous month that left 130 dead, security was increased for the annual event. A survey released the previous day found that two-thirds of Germans believe a terrorist attack will occur in their own country in 2016. (Photo by Adam Berry/Getty Images)

BERLIN, GERMANY - DECEMBER 31: Police officers hold a meeting prior to a public New Year's Eve party at the Brandenburg Gate on December 31, 2015 in Berlin, Germany. After the terrorist attacks in Paris the previous month that left 130 dead, security was increased for the annual event. A survey released the previous day found that two-thirds of Germans believe a terrorist attack will occur in their own country in 2016. (Photo by Adam Berry/Getty Images)